Abstract
The human polyoma virus BK (BKV) has a 5 Kbp double-stranded (ds) DNA genome packed with host cell histones into a minichromo-some. Two out of 5 rabbits inoculated with infectious BKV produced detectable anti-dsDNA antibodies. In two additional rabbits antibodies against idiotypes of anti-dsDNA antibodies were elicited. These findings strongly indicate the existence of immunocompetent anti-dsDNA clones which are regulated, at least in part, through a network mechanism by anti-idiotype antibodies.